.container{
    width: 1000px;
    margin: 0 auto;
}

.banner{
    height: 100px;
    background: lightgray;
    /*background-image: url("imgs/star.png");*/
}
.content{
    height: 300px;
    background: lightblue;
}
.footer{
    height: 100px;
    background: lightgray;
    text-align: center;
    line-height: 100px;
}

